neon,neon_files: Display error message when file can't be opened

packages/neon/neon/lib/l10n/en.arb

@@ -34,6 +34,7 @@
       }
     }
   },
+  "errorUnableToOpenFile": "Unable to open the file",
   "errorUnsupportedVersion": "Sorry, this Nextcloud {name} version is not supported.",
   "@errorUnsupportedVersion" : {
     "placeholders": {

packages/neon/neon/lib/l10n/localizations.dart

@@ -179,6 +179,12 @@ abstract class AppLocalizations {
   /// **'Permission for {name} is missing'**
   String errorMissingPermission(String name);
 
+  /// No description provided for @errorUnableToOpenFile.
+  ///
+  /// In en, this message translates to:
+  /// **'Unable to open the file'**
+  String get errorUnableToOpenFile;
+
   /// No description provided for @errorUnsupportedVersion.
   ///
   /// In en, this message translates to:

packages/neon/neon/lib/l10n/localizations_en.dart

@@ -72,6 +72,9 @@ class AppLocalizationsEn extends AppLocalizations {
     return 'Permission for $name is missing';
   }
 
+  @override
+  String get errorUnableToOpenFile => 'Unable to open the file';
+
   @override
   String errorUnsupportedVersion(String name) {
     return 'Sorry, this Nextcloud $name version is not supported.';

packages/neon/neon/lib/neon.dart

@@ -72,12 +72,12 @@ part 'src/utils/app_implementation.dart';
 part 'src/utils/bloc.dart';
 part 'src/utils/branding.dart';
 part 'src/utils/confirmation_dialog.dart';
+part 'src/utils/exceptions.dart';
 part 'src/utils/global.dart';
 part 'src/utils/global_options.dart';
 part 'src/utils/global_popups.dart';
 part 'src/utils/hex_color.dart';
 part 'src/utils/localizations.dart';
-part 'src/utils/missing_permission_exception.dart';
 part 'src/utils/nextcloud_app_specific_options.dart';
 part 'src/utils/push_utils.dart';
 part 'src/utils/rename_dialog.dart';

packages/neon/neon/lib/src/utils/exceptions.dart

@@ -5,3 +5,5 @@ class MissingPermissionException implements Exception {
 
   final Permission permission;
 }
+
+class UnableToOpenFileException implements Exception {}

packages/neon/neon/lib/src/widgets/exception.dart

@@ -108,6 +108,12 @@ class NeonException extends StatelessWidget {
       );
     }
 
+    if (exception is UnableToOpenFileException) {
+      return _ExceptionDetails(
+        text: AppLocalizations.of(context).errorUnableToOpenFile,
+      );
+    }
+
     if (exception is NextcloudApiException) {
       if (exception.statusCode == 401) {
         return _ExceptionDetails(

packages/neon/neon_files/lib/blocs/files.dart

@@ -101,7 +101,10 @@ class FilesBloc extends InteractiveBloc implements FilesBlocEvents, FilesBlocSta
           }
           await _downloadFile(path, file);
         }
-        await OpenFile.open(file.path, type: mimeType);
+        final result = await OpenFile.open(file.path, type: mimeType);
+        if (result.type != ResultType.done) {
+          throw UnableToOpenFileException();
+        }
       },
       disableTimeout: true,
     );